Public bug reported:

I have camera D-Link DCS-2103. When I connect vlc to it via rtsp:
vlc -vvv rtsp://192.168.24.5/live1.sdp
I got window with message: "No suitable decoder module:
VLC does not support the audio or video format "g726". Unfortunately there is 
no way for you to fix this."
I terminal I see:
"[g726 @ 0x7fbfb80983c0] Invalid number of bits 0
[0x7fbfb8030a88] avcodec decoder error: cannot open codec (G.726 ADPCM Audio)
[0x7fbfb8030a88] main decoder error: no suitable decoder module for fourcc 
`g726'. VLC probably does not support this sound or video format.
"
I see video, but not listen audio.

But avplay works fine:
$ avplay rtsp://192.168.24.5/live1.sdp
avplay version 0.8.1-4:0.8.1-0ubuntu1, Copyright (c) 2003-2011 the Libav 
developers
  built on Mar 22 2012 05:09:06 with gcc 4.6.3
[rtsp @ 0x7fb1bc0008c0] max_analyze_duration reached
[rtsp @ 0x7fb1bc0008c0] Estimating duration from bitrate, this may be inaccurate
Input #0, rtsp, from 'rtsp://192.168.24.5/live1.sdp':
  Metadata:
    title           : RTSP/RTP stream 1 from DCS-2103
    comment         : live1.sdp
  Duration: N/A, start: 0.000000, bitrate: 32 kb/s
    Stream #0.0: Video: h264 (High), yuvj420p, 1024x768 [PAR 1:1 DAR 4:3], 75 
fps, 9k tbr, 90k tbn, 150 tbc
    Stream #0.1: Audio: g726, 8000 Hz, 1 channels, s16, 32 kb/s
    Stream #0.2: Data: [0][0][0][0] / 0x0000
[avsink @ 0x7fb1a8001020] auto-inserting filter 'auto-inserted scaler 0' 
between the filter 'src' and the filter 'out'
[scale @ 0x7fb1a8001700] w:1024 h:768 fmt:yuvj420p -> w:1024 h:768 fmt:yuv420p 
flags:0x4
   2.05 A-V: -0.036 s:0.0 aq=   22KB vq=  637KB sq=    0B f=0/0   f=0/0

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: vlc 2.0.1-4
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Sat May  5 11:58:36 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcEnviron:
 LANGUAGE=ru:en
 PATH=(custom, no user)
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
SourcePackage: vlc
UpgradeStatus: Upgraded to precise on 2012-04-17 (17 days ago)

** Affects: vlc (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/995003

Title:
  VLC doesn't work with g726 codec

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